Institutions are not usually geared up to detect unethical work proactively. So it is usually up to the referees, readers and the research community to be alert, and to blow the whistle. Certainly after a researcher has breached the research code of conduct, the institutions should suspect and look for other breaches.
As the others I am in agreement. For several reasons I will mention one. Back in the 80's I believe, researches in Utah, (U.S.) leeked news about cold fusion. The is leek in the next two days went national, all the news stations, news papers, they were interviewd published their findings. The Journal is still in buesness to researchers are not.
Usually, academic institutions do not review the articles to be published in journals other than their own journals. Research misconduct ought to be discovered by the referees, assigned by the "external" journals, before publication. If, later on, some smart reader finds out cheating then contacting the journal & the university becomes a "humanitarian" duty.